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The '''American Ornithologists' Union''' ('''AOU''') is an ornithology|ornithological organization based in the United States. Its members are primarily professional ornithologists although membership is open to anyone with an interest in birds. The AOU is a member of the Ornithological Council and Ornithological Societies of North America (OSNA). The Union publishes the scholarly journal ''The Auk'' as well as the ''AOU Checklist of North American Birds''
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AbbreviationAOU | motto =
PredecessorNuttall Ornithological Club
Formation{{Start date and years ago|1883|09|26}}
TypeNon-governmental organization|NGO
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